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Unformatted text preview: Probiem 6,2 6.2 A square box beam is made oftwo 20 x 804mm planks and two 20 x 120—mm
planks nailed togsther as shown, Knowing that the spacing between the nails is s = 30
mm and {hat the verticai shear in the beam is V= 1200 N, determine (a) the shearing force in each nail, (b) the maximum shearing stress in the beam, ether to form a beam that is 6.3 Three boards, each .
rtical shear, Knowing that the allowable shearing force in each m“
f the spacing s between the mags is 3 in‘ subjected to a we
is 150 1b, determine ma allowable shear '1
ii ' , are nailed tog 6, 6 The beam shown is fabricated by connecting two channel h ,
‘ 5 3138mm ameter spacad longitudinally every 7 5 in D
‘ ‘ me using boits of %xin, di
the bolts caused by a shearing fame ems 3‘.
~» zaps average shearing stress in
the y axis, ., n
Qf% lax ﬁgs} :3 P we M 6.9 through 6.12 For the beam and loading shown, consider section n” and
determine (a) the hrgest shearing stress in that section: (b) the shearing stress at poim 12 mm 150 mm’
12 mm J Problem 8.10 0.3 m . A“ sash”
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pmbie 8‘ {Ziisgible spacing 5 ofth ram S:
P shear of 1200 lb. Knd'
s is 75 lb, determfn e the lags :“uﬂlt’g
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Ext n beam shown is subjected to a Vemcm “x paced mngimdinally every 60 mm a” anyear of me in the nails (:2) at A‘ (b) at B. (Givenﬁeryg
\ . “:1 6.32 The builtup wcode
Knowing that the nails are 5
at B, determine the shearing f0 109 mm?) Dimensions in mm 6,44 A beam censists of three planks connected as shown by %in.5iameter boks 3
spaeed every 12 an. aiong the longitudinal axis ofthe beam. Knowing that the beam is
subjected to a 23004}: verticai shear, determine the average shearing stress in the baits. prcﬁem 62% Thief: 1 x: ES—in, Stefﬁ gates are Eel/in iii) {bar if; 6 x 3. angles :0 form a beam with the cross section shown. The: baits have ﬁimmser and are spaced
longimdinaﬂy every 5 in‘ Knowing that the allowable average shearing stress in the
boks is 1”) "i, ,emains i115 lai'gsst germiﬁsikie vertiixaé ahegr in me: E? m. (Given: IX
1 = 6123 it! 5‘ ...
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 Fall '10
 Maldovan
 Force, Shear Stress, Shear strength, average shearing stress, allowable shearing force, rtical shear

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